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Message-ID: <4C64191D.8050609@16systems.com> Date: Thu, 12 Aug 2010 11:54:05 -0400 From: Brad Tilley <brad@...ystems.com> To: john-users@...ts.openwall.com Subject: Re: Consonant Vowel Patterns websiteaccess@...il.com wrote: > About trigraph, digraph, stats. > > http://letterfrequency.org/ I'm not sure this is the same thing. Word and letter frequency (while important) don't translate to popular CV patterns. Take an English dictionary, for example, and run all the words in it through a CV pattern generator placing your results into something like a C++ multi-set container. Then you can easily tell what patterns are predominant. Some patterns are thousands of times more likely than others. While the pattern CVCCVC is *very* frequent, many passwords it cracks are not frequent at all. The other good thing about this approach is that it recognizes non-word patterns often generated by password generators that produce "pronounceable passwords" KugHot NakLut WotRel ... Also, pattern under 6 chars would be best left to brute force. Brad
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